David Cameron

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Ukraine's MP Vitali Klitschko, leader of the UDAR (Ukrainian Democratic Alliance for Reform) party, centre right, greets a protester outside 10 Downing Street in London after a meeting with British Prime Minister David Cameron and Foreign Secretary William Hague, Wednesday, March 26, 2014. (AP Photo/Sang Tan)

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Ukraine's MP Vitali Klitschko, leader of the UDAR (Ukrainian Democratic Alliance for Reform) party leaves, after talking to protesters after addressing them outside 10 Downing Street in London after a meeting with British Prime Minister David Cameron and Foreign Secretary William Hague, Wednesday, March 26, 2014. (AP Photo/Sang Tan)

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A high level meeting between British and Ukrainian leaders, with left to right, Petro Poroshenko, the Leader of the Ukrainian Democratic Alliance for Reform party (UDAR) Vitaly Klitschko, British Prime Minister David Cameron and Britain's Foreign Secretary, William Hague, as they meet inside 10 Downing Street, London, Wednesday March 26, 2014. (AP Photo / Dan Kitwood)